Contingency Budgets: How Much Cushion Is Enough?

Ask homeowners what scares them most about remodeling and you'll rarely hear "picking tile." It's the fear of the runaway budget — the project that starts at one number and ends somewhere painful. The single best defense against that fear isn't optimism. It's a contingency: money set aside, on purpose, before construction starts, for the things no one can see yet.

A contingency isn't an admission that your builder doesn't know what they're doing. It's the opposite — it's what experienced builders insist on precisely because they know what walls can hide. The real questions are how big it should be, what it's allowed to pay for, and what happens to it if you don't use it.

What a contingency is actually for

The cleanest definition: a contingency covers discovered conditions — things that genuinely could not be known until demolition. In San Diego's older housing stock, the usual suspects are familiar. Behind the plaster of a Spanish revival or the paneling of a midcentury ranch you might find corroded galvanized plumbing, framing that was never quite right, hidden water damage from decades of small leaks, or wiring that needs more than a patch — a topic we covered in depth a few weeks ago.

What a contingency is not for: upgrades. Deciding mid-project that you'd rather have the bigger window or the nicer counters is a change of scope, and it deserves its own honest conversation and its own line item. Blurring the two is how budgets quietly dissolve.

How much cushion makes sense

There's no single right number, but the pattern is consistent. For a newer home with a cosmetic-leaning scope, a cushion around ten percent of the construction budget is usually comfortable. For older homes, projects that open a lot of walls, or work that touches plumbing, structure, and electrical at once, fifteen percent is more realistic. Hillside lots, homes with a history of amateur renovations, and anything involving excavation earn twenty. The age of the house matters more than its zip code: a 1928 bungalow simply carries more unknowns than a 1998 tract home, no matter how lovingly either has been kept.

One more nuance: the contingency should scale with the construction portion of the budget, not the total. Fixtures, appliances, and finishes you've already selected and priced carry little uncertainty; the labor and the hidden systems carry nearly all of it.

If a bid arrives with no contingency at all, be careful — the unknowns don't disappear because nobody budgeted for them. They just arrive later, as change orders, when your leverage is lowest and the pressure to say yes is highest. A builder who names the risk up front is doing you a favor, not padding the price.

How design-build shrinks the unknowns

The size of the cushion you need is mostly a function of how much investigation happened before demo day. This is where the design-build model earns its keep: because design and construction live under one roof, the people pricing your project are the same people who will build it, and they investigate accordingly — crawling the attic, scoping drains, checking the panel, opening a small exploratory hole where the plans hinge on what's inside a wall. Every unknown converted into a known before contract is a dollar that moves from "maybe" to "planned."

That diligence is part of what you're paying for with an established firm, and it's also why waiting rarely helps — as we wrote in The Cost of Waiting, budgets age in only one direction.

The happy ending: unspent cushion

Here's the part people forget: a contingency is your money. If the walls turn out to be kind and the cushion goes untouched, it doesn't vanish into the project — it stays yours, or becomes the landscaping, the better appliance package, or the outdoor living phase you'd deferred. Plenty of our clients end a project having spent some of their contingency and redirected the rest. That's not luck. That's what a well-scoped project looks like.

More on this in Phased Remodeling: Big Vision, Staged Budget.

So when you're setting a remodel budget this year, don't ask "what will this cost if everything goes perfectly?" Ask "what's my number with a real cushion built in — and can I be happy at that number?" If yes, you're ready to build. Request a consultation or give us a call — we'll help you set a budget honest enough to survive contact with your walls.